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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa7f7b700f4fa86e7b45cb994fc3c7dc40ef58d97c1511f88a7bfdf779c1fb3' 
  AND token = 'RZc8XUqSdEaPF3cnNpIZfen8+JNvwv+9HGjJJezhoG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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