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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4615285d7c3f0b35b632b34e6d80ce801cd7907876a6b668cbdc59ddd26ab29' 
  AND token = 'NSjkCpX8PYJnaBP31hnhNWjkqS2ofQ/ingzYJApAtSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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