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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac64bdb77f36a17fa1e23198837a63bc3fb25dead9228ff17f64ead04d591ff4' 
  AND token = 'D0QSd25l93G77qEIxgBYE/8+nbzts03Y3p2uVE6kaQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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