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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde5c624b26e1abe37b7f4ecb785ec003d0e7d6c91c5ef8144b4e20ee22b2ba5' 
  AND token = 't+pr6S3XJlxwga58ObWFvjrYb+ff1S8eC4On9GFdcNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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