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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b5aa4cc61ac3e7da1b6a55f07293b5dfc3d85aa4cb7cc13403b704a53ea38f' 
  AND token = '/8LtrQlpxLmsmk/SqLti/DvGDJMBcrBrwDKaTRC3ylk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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