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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33680f0f045f78828ae80ed9e6fe9b20b317354cb2eb78c30e3b2d39f70b168b' 
  AND token = 'OiHeHFKJRFfQSfkfywAIfeBVwIQNm/5DSooSSG/A80I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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