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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d7a1e110a62fc829e9623680b8e39702a03e76ca70a18cd9d3db96c185bd2e' 
  AND token = '0NUntHq8EeZYCZckHTm4URbUvEKBW2rznjBMVp9J2rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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