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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ee61024a648445d2455aa7363c03e9601bcb91ba4973591662f4014e2ad8a9' 
  AND token = 'FnFOktQ4Uvs0y8nFJGp4tEX4lckoYlTG4a4SExcCZio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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