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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1cef7dab44cfb23f9dc1826bb0e7ed64fcc56d7929ea24f2402c0e7f9acde6' 
  AND token = 'BxcEfek9x3j16e7UifBPXMAzZAuMHFsQ/tkUeXbybMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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