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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b1d2ac779516d4d7662bc491452ae6e5571cbc0f3d6f0f0ad37975014e6e70' 
  AND token = 'pGVFPNQXsZ1yEqzxeMd2tO3QRvJs99sKBkv4CMM1QA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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