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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b15f9c2e5e2b5d05271a1829d3822ce278daaa0535e12e4a83ba51fa9b3e69' 
  AND token = '7cSi9Kg5przlAbMdP277dhx0vTXl/DbDogDNKTVz798=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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