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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59340742f2ac9e8a2a88174ddabeedbd21ed3da7aed7eaee0f91d6b75f562c44' 
  AND token = '3Q1c4fTx7ErlwELfWjmx1uyn7spb9rFZ07X80alho7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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