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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27bb355e47b701894b870518f627113a757583e5a213f25a8814860012cfbbb' 
  AND token = 'bAdhQ+MR2lSuQFi0/HRhFqOznvxYpoJ7sc+t/ews96s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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