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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbf9d9060e15cbbe433d46f606e6534a14452df13583a9c5975225f3d778ba2' 
  AND token = '/Ox5oiEKwTSIihlhQqGINZ4dHyqT1Lz5o4r+jTHE7tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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