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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec0b10d2c20414817b0330473c4eb6fe9aedf1cdb262f608ccf441bfa928535' 
  AND token = 'zdiBI6Z6srRSlsTcNIQvrM7Y/Qqg6OVJlzcfUU//O3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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