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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab39480a7617c540d954794a1b60269da1b7a0c279a0eaf9e51d35a8ec94b8f4' 
  AND token = 'dT4m6yf2T8eznDo+oHXpuvXWDdF5fX9ZNq0Lcqpaihw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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