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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee7d80a311272f156fe79cb054b733daee025ccfccbfaa2936d1e9e8e193ac4' 
  AND token = 'Q20/IYxPG1dZDWe9vuqZ+SOJQG29NEd0KNztdsiGVnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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