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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49b49b9ebbdc380bf4aa6ccf96abdb27c4586c336258defc91e9cc89ca06868' 
  AND token = 'qrcSepKWm4IJjEG3z4Dykrd+OIW3NqS/dizraI2woZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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