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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5d938e9de94573375a62165e6b4fd595683a7498b1d828dcf77ded3e16a754' 
  AND token = 'W810S7HfjR7zIrTIt6ge8762ZoGGa/1/K0HsO8pZCTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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