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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b77e7208fc5c413aec0637ee9732f401fd87c401dcfa44ba172e2d7222e331' 
  AND token = 'ohiF0e0DZi+7jK+P/1vY0x5o8yB4kT0F/PNSF4sr94I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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