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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c9dd2c312ea991ace747cf51029a32e282f70fa92dd03921f667e4d827892a' 
  AND token = 'i9o6f63OfCDebB4S0/1UHgoa4vksJ4VbUyOm23l2h18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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