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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8182778865a2b8477d6bae3d122abf5bc6e437c20c7bd18142c79cfff665e117' 
  AND token = '4myRyap+Z2a7zBJgJJeGfcguAhjlg/qq85nD5eGaue4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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