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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f73a24ca948e0cfe4181481aa0dcad6e64c779300b3a4145f8cc7a95bd5d748' 
  AND token = 'KC0cu56dLjEOEA6YEN9oRztiFkNUrqxC6rc+dopU33I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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