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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16c48b3aa8cec27b5251d48f9bfc8ac9d1bdb1c5dc3c74b90240c47a4909e5d' 
  AND token = '0HVsEvMrTG6HMjmSpj/Nn80zh7T62jMilODJE3a2wFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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