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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5884f8db58de0249fdc61a7e2356ab59462caec8504f3d3152172f2baa6f7772' 
  AND token = 'OCQijCZG6mi9/+3f2JHda2u+WG1trdqAH+qATDl88lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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