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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c072f39b6b475b586eb3698f6e47cf5d3b601edea8e023be72b384492f31ff' 
  AND token = 'oUHv6UL0wwG4lCnntuD9evhHnU//Y+HYaMg4AOc/D2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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