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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef4b38bcef7f1fa2168f056d8d8a6ad4c7132a10b9a73a11071c713cbdb4283' 
  AND token = 'CQTVOVCUXj15A07scDXZFnKd8k2wAz+7vJssNqH/rAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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