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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0830e088964d99b374e82f33bc313b2fb1fc0f052b7d360062201e82bb19c0d' 
  AND token = 'uDX8fhqo4uFYa1KvfC0GTIUoYDkJtGqSFDAt+PlG6Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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