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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc5dd7055e725d40b29982bc972c83f6d819405fe9deba0d631318dfd895d13' 
  AND token = 'vgIwdAk9Ae9NBqedle0Af0WwaZutNZ6MWc8caYUO+KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00243

JSON explain

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