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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd7e89f81dbe6153f0797fa5c0f13dbe682d71679f8f7a7823478db41745c3f' 
  AND token = 'Ux5XfC6GqkyvK4od99VJVg6cv0cWxROI4ga3T3bxqb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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