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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af723f01c136fc59961f9f47eb4ce43493a59d2d15402f2839511db6138677f6' 
  AND token = 'Nd5glZz9QcC/gFVLVNJAJF3CMS6Ke3k3CIeofTfUnEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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