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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e1b5b5a1b254ceb1f2cf3ae590088a02a4188c58ecb72b864ccddec190595a' 
  AND token = '8vV6Zil10bLoi0zvuk6ci2JrcNU56FSGZf0iCpBtKEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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