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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8b98d46422b302b8e1ee09f5da7efe56a3f352ce7cd16430930d33fb67f792' 
  AND token = 'RMkVDLVgYl/juljNQcVGk8i0Yj08DOi/wALAlY4uZSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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