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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962dc5b5549c9f70e10d8ec6477e9e78cbd809a91a9f42f2dc92a766b1a24723' 
  AND token = 'pQzDZYbxi7Ja704b2e7CbudGxKYRNbLD6ouOw+80lBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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