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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad71bfa726efb7f15d7d6de3264ff99e18de3d437a4ab067a557e24d0ebee93' 
  AND token = 'ZCEwKcnya3Vsr3YC3AO631J2VnYoaV5y1q7rkajPpFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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