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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c789709c3b6d4011de7e0b87ba496c9da35c902dd5b9fad277c755b6b84f5f' 
  AND token = '9mmW+yH7ElnsO1YwWtjhg8e5IIWYQGI/sjFTpcCNikg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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