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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9267fb5bf36766b228a5fb24514d6ffe13945a6404c4be2e97500f8118a86a59' 
  AND token = 'vqlEp0u5/UIsyoSbFikoPBRlSctaAJUN1/UuWgqokJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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