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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7128c393e2b7376f33b909e01e62aa19032afe693b64a5e91c454094e2e9510b' 
  AND token = 'tcVWnM3w+KS7vgnY7cJP3/NuNQFdsmB2u245k+NdY7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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