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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb75e3f9b6863d6f3ae50be6a3763aca2c559bd6f85bbedfb91e24c6e2c6d35c' 
  AND token = '0ENqvPnUYag6jtRRHcg8sq+WiNhcmYYrc1ahr6NeDTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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