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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfaaf62b52ac8ac6614fffb833cedfb340210892d8af1df1a68e65ef65a26c38' 
  AND token = 'sbD/1Qz4mvYsBp/JSSVVbx2BdE4s02g/SXY0IpH3B/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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