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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a26d371f58fbe97fc4c819f232efba55ee3e465887eae0a31ab36709c95dddd' 
  AND token = 'pSD+G3bugITGUCQLNvIa2fA8vdTs7SI79QCrqYs9wzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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