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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d09f092303566818c621068140b26a2a5857bec5b80937d7aa78eb3bfede85a' 
  AND token = '1M9I0A66DhDGWNtZdoFwO/AwA8UYqH/219VvEKPTVPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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