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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbfb1232a6226ee857f438a8c0735910e1b96cb71d13cecae6000f8198fd489' 
  AND token = 'AkYq+x4iWBtXkFAP8TiaXxYlMPFy91Q8md90KUd+R+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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