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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df82b00fdb66051cd237592cc0de6846430c17fbe5186123c5b94bd3f6c9455' 
  AND token = 'S8GfiAiRwQntB1GT2DA1R/gV+8ZqGkc52s0FPVVYn7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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