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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fada46976529ee7b6b6becbb11fc5bc19cfe69f9292bb054429dea48150ad89' 
  AND token = 'LhVFn5vzge+5DhD6pXMJbyhdKFktSpCAbbURsIPGJQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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