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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95718b63f041fd4d387e601bf1c8fbf5caacb14f9b2dacff42a04a4abfb9c44' 
  AND token = 'NQutHKDYgKcNGJ/6fnpn6jnSBVVtcJJJGN/3G3kVCms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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