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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebaddadd807ea0be16fd0d9721003cb41a174fc9489f2bab10e755e1acf059e8' 
  AND token = 'vun5qlBbOqYUUAEsuUE3jza0sG64neYxvpAEYjZIj3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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