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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ff283f1287a5b11358064187bd9bb715f54a098e6c59ba25f4dd1c42fbff91' 
  AND token = 'qjoCjMKT+g9+v0Od8kAjBiCNpqW1g2BDtt5X5uWj8N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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