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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0082a8a11073e11228bee9ea71bc280ef6781e4228ac15b72b4e9d864b10e5' 
  AND token = 'YMttNQR2rCX8mwO8DeECVKVCttJkase0lYgXzLpKFa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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