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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2c3de89a6155ec698dbd49fd745ebb3d93298aaa77e716cda531d56f014079' 
  AND token = 'jzKt9nNAzZXzUbVeNM9TjHIcCHpn+0OPY6G4rENc008=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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