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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a28a9cd1a01509437f231c313383ac8b5f6657d34982a0525fcc9e79c669bb' 
  AND token = '3laRuUk7dff4EAgK2pyhdDtzjD1liHO1EDEjXKxjOGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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