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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf812a4eb3267594b14521ae8b69586b00bbccab4766a7934237b20d34dca4cf' 
  AND token = 'FByzpLskbTjQpUT3Dy4oYZNqs9EDBvPuLcN+6XbNFtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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