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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdede2c0ba83cbc131f1ec2a731898118671754cb7bbb00c7a71ebae9985e38a' 
  AND token = 'lNJH1FBm3xvm6/rjRj0guyZM0zKjEQxzQnrcX0OfHvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}