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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f42f9ce7a6ff8cd5b8b7ffff8dbadd24ae559f9e6a98f33daf268632f0896c' 
  AND token = 'ITAoX5sn/b24coC01AC7i3NykIIautzjSjJRjQD/8eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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