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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8640ee86545739adf7136a3de995e3e44219f5ceebb5596417ef11648a3eecb' 
  AND token = 'xGYWfEtmT3G9EayrVvrEyH6ESiu44QiqaYjMEi2U92Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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