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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcadf870b5e8529d4c7a4f04a4e0586bd6a7799c07d20caaf107d3cded847f78' 
  AND token = 't83SF7X/eq0+UFk/pR9d59KtqVVuMl+gvZHrxudknQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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