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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309872c9c7c9f990087362769f1fdf9c2e38775d4f6b9fd6b87605764037b1e8' 
  AND token = 'g/1QHrggqJefeEpwyA4FA3V/wc1n2MzUJlVPUOC+F2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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