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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f4a3ae76d40a3eea806e9531f4ca4fc3c7efbd444dccfae5f318b9420c46c2' 
  AND token = 'kcLwhegq5M+xIflULIP8U9vfq4yWX7JD8mR3bp4izhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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